CN105499922A - Laminated rolling process for thick aluminium alloy plates - Google Patents
Laminated rolling process for thick aluminium alloy plates Download PDFInfo
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- CN105499922A CN105499922A CN201510939875.2A CN201510939875A CN105499922A CN 105499922 A CN105499922 A CN 105499922A CN 201510939875 A CN201510939875 A CN 201510939875A CN 105499922 A CN105499922 A CN 105499922A
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Abstract
The invention discloses a laminated rolling process for thick aluminium alloy plates. The laminated rolling process comprises the following main steps: smelting and casting aluminium alloy blanks into aluminium alloy cast ingots with thicknesses of 350-450mm; milling the surfaces of the cast ingots and carrying out homogenization treatment; pre-rolling and thinning the cast ingots to thicknesses of 150-250mm; carrying out surface treatment and laminated electric welding, and preheating to 400-460 DEG C and then carrying out laminated hot-rolling and welding, with a pass reduction of 10-20% during the welding process; carrying out diffusion annealing on the laminated cast ingots subjected to the laminated hot-rolling and welding under a condition of 460 DEG C; and after the annealing, directly hot-rolling the laminated cast ingots into the needed finished thick aluminium alloy plates by virtue of the waste heat of the diffusion annealing. According to the invention, the pre-rolling procedure and the laminated rolling technology are carried out by virtue of the thin-specification aluminium alloy cast ingots, and metallurgical quality problems of macrosegregation, core crystal grain coarsening, centre porosity, low structure uniformity, casting stress and cracks, and the like of super-thick-specification cast ingots are avoided, thus the production efficiency and the yield of the thick aluminium alloy plates are remarkably increased, and energy consumption is reduced.
Description
Technical field
The present invention relates to metal material moulding processing technique field, particularly relate to a kind of aluminium alloy thick plate laminated rolling technique.
Background technology
Aluminium alloy thick plate is the important structural material of modern aerospace industries, and aluminum i ndustry circle of current developed country is devoted to develop can the novel process of novel aluminum alloy slab of production performance excellence.Its product comprises the high strength alumin ium alloys such as 2024,7075,7050, is mainly used in the parts such as the fuselage of aircraft industry, wing and covering.
Current production aluminium alloy thick plate mainly adopts slab hot-rolling method, general selection thickness is 600mm and above ultra thick gauge aluminium alloy cast ingot blank, conveniently hot rolling production process, namely through milling face, homogenizing annealing, then direct from slab hot-rolling finished product sheet material.The ultra thick gauge aluminium alloy cast ingot blank that this method uses, there is cooling velocity gradient in ingot casting top layer to center, makes ingot casting there is the metallurgical quality problem that on gross segregation, heart portion coarse grains, center porosity and cross section, uneven microstructure, casting stress and crackle etc. are serious.Production practices prove, the still residual and heredity in follow-up hot procedure of this kind of casting flaw, to finished product slab, causes the obdurability of finished product slab and fatigue behaviour to reduce, thus high-quality slab product qualified rate is sharply declined.
About the technology using aforementioned such conventional method to manufacture aluminium alloy thick plate, in actual production, there are the following problems, as produce 7050 alloy 4000mm wide/200mm heavy-gauge sheeting, the ingot casting of 600mm thickness must be adopted, but macroscopic segregation of cast ingot more than 10%, centre microporosity is serious, fatigue behaviour is difficult to reach instructions for use.And the compound segregation defects often occurred in 5A06,7075 and 2024 large gauge ingot castings, be also the main cause causing slab to scrap.In addition, in order to eliminate the defects such as the microsegregation of ultra thick gauge ingot casting, need to carry out long homogenizing annealing more than 460 DEG C, in actual mechanical process, its production efficiency is lower, and energy consumption is higher.
As previously mentioned, for improving the quality of aluminium alloy thick plate, strictly must control the defect existed in ingot casting, and when ultra thick gauge ingot casting is produced, this kind of metallurgical imperfection problem is not resolved so far.
Therefore, how improving the quality of aluminium alloy thick plate, is the current technical issues that need to address of those skilled in the art.
Summary of the invention
The object of the invention is to solve the metallurgical quality problem that on ingot casting exists in prior art gross segregation, heart portion coarse grains, center porosity and cross section, uneven microstructure, casting stress and crackle etc. are serious, and enhance productivity in actual mechanical process, reduce energy consumption.In order to achieve the above object, present invention employs following technical scheme:
A kind of aluminium alloy thick plate laminated rolling technique, comprises the following steps:
Melt melting, carries out melting by aluminum alloy blank, obtains melt;
Ingot casting is cast, and is become by described melt casting thickness to be the aluminium alloy cast ingot of 350 ~ 450mm;
Ingot mill surface and Homogenization Treatments, remove the defect layer that described aluminum alloy cast ingot surface 15 ~ 25mm is thick, and amputate casting constriction, then described aluminium alloy cast ingot is carried out Homogenization Treatments;
Ingot casting rolls in advance, described aluminium alloy cast ingot is carried out rolling in advance thinning, is rolled rear ingot casting in advance, and rolling temperature is in advance 400 ~ 460 DEG C, and the thickness rolling rear ingot casting is in advance 150 ~ 250mm;
Surface treatment and lamination electric welding, by the method that polishing or erosion are washed, pretreatment is carried out to the described contact interface rolling rear ingot casting in advance, then fill neatly stacking for pretreated ingot casting with lamination machine, the laminate interface surrounding electricity consumption solid welding of ingot casting is fixed, obtain lamination ingot casting, again described lamination ingot casting preheating is carried out lamination hot rolling welding after 400 ~ 460 DEG C, reduction in pass is 10% ~ 20%;
Lamination diffusion annealing, be carry out diffusion annealing under the condition of 460 DEG C in temperature by described lamination ingot casting, annealing time is 12h;
Hot rolling, carries out hot rolling after described lamination ingot casting is cooled to 400 ~ 460 DEG C, obtains aluminium alloy thick plate, and the hot rolling target thickness of described aluminium alloy thick plate is 100 ~ 300mm.
Preferably, in above-mentioned aluminium alloy thick plate laminated rolling technique, in melt melting step, described aluminum alloy blank obtains melt A after the melting that smelting temperature is 700 ~ 750 DEG C.
Preferably, in above-mentioned aluminium alloy thick plate laminated rolling technique, in melt melting step, online degassing processing is carried out to described melt A, obtains melt B.
Preferably, in above-mentioned aluminium alloy thick plate laminated rolling technique, in melt melting step, birotor off gas system is adopted to carry out online degassing processing to described melt A.
Preferably, in above-mentioned aluminium alloy thick plate laminated rolling technique, the hydrogen content of described melt B is within 0.12ml/100gAl.
Preferably, in above-mentioned aluminium alloy thick plate laminated rolling technique, in melt melting step, carry out double-stage filtering to described melt B, the first order adopts 30 ~ 40ppi ceramic filter plate to filter, and the second level adopts 40 ~ 60ppi ceramic filter plate to filter, and obtains melt C.
Preferably, in above-mentioned aluminium alloy thick plate laminated rolling technique, in ingot casting casting step, semi-continuous casting method is adopted to cast described melt C.
Preferably, in above-mentioned aluminium alloy thick plate laminated rolling technique, in ingot mill surface and Homogenization Treatments step, adopt the defect layer that described in milling machine mill off, aluminum alloy cast ingot surface 15 ~ 25mm is thick.
Preferably, in above-mentioned aluminium alloy thick plate laminated rolling technique, in ingot mill surface and Homogenization Treatments step, in batch-type furnace or shaft furnace, described aluminium alloy cast ingot is carried out Homogenization Treatments.
Preferably, in above-mentioned aluminium alloy thick plate laminated rolling technique, described Homogenization Treatments temperature is 460 ~ 475 DEG C, and temperature retention time scope is 10 ~ 24h.
Aluminium alloy thick plate laminated rolling technique provided by the invention has following beneficial effect: the sheet material prepared by the present invention adopts the Thin Specs aluminium alloy cast ingot sheet material of 350 ~ 450mm, ensure that the excellent metallurgical quality of ingot casting; Rolled in advance by ingot casting before lamination and improve ingot casting section structure uniformity; Laminated rolling, diffusion annealing and hot rolling three-procedure progressively improve the metallurgical machinery bond strength at laminate interface place, are conducive to the performance improving product; And adopt diffusion annealing waste heat to carry out hot rolling, save the energy further and be convenient to continuous seepage.Compared with the aluminium alloy thick plate that the present invention is standby with conventional hot rolling ingot legal system, plate defect is few, and structural homogenity is good, product obdurability and fatigue behaviour up to standard, yield rate significantly promotes, and has good economic benefit and social benefit.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is aluminium alloy thick plate laminated rolling process chart provided by the invention;
Fig. 2 is the former technique of 2024 alloys and the metallographic structure comparison diagram of laminated rolling technique of the present invention;
Fig. 3 is the former technique of 7075 alloys and the metallographic structure comparison diagram of laminated rolling technique of the present invention;
Fig. 4 is the former technique of 5A06 alloy and the metallographic structure comparison diagram of laminated rolling technique of the present invention;
Fig. 5 is the former technique of 7050 alloys and the metallographic structure comparison diagram of laminated rolling technique of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Please refer to Fig. 1, Fig. 1 is aluminium alloy thick plate laminated rolling process chart provided by the invention.
A kind of aluminium alloy thick plate laminated rolling technique, comprises the following steps:
Select materials, first need to select corresponding aluminum alloy blank, the blanks such as such as 2024 alloys, 7075 alloys, 5A06 alloy or 7050 alloys according to the material of the aluminum alloy plate materials that will produce;
Melt melting, carries out melting by above-mentioned aluminum alloy blank, obtains melt; This step specifically can comprise melting and melt treatment: be first that under the condition of 700 ~ 750 DEG C, melting obtains melt A at smelting temperature, then, birotor off gas system is adopted to carry out online degassing processing to melt A, obtain melt B, the hydrogen content of melt B within 0.12ml/100gAl, finally, double-stage filtering is carried out to melt B, the first order adopts 30 ~ 40ppi ceramic filter plate to filter, and the second level adopts 40 ~ 60ppi ceramic filter plate to filter, and obtains melt C;
Ingot casting cast, by the melt C after above-mentioned filtration routinely semi-continuous casting method cast, obtain the aluminium alloy cast ingot that thickness is the Thin Specs of 350 ~ 450mm;
Ingot mill surface and Homogenization Treatments, with the defect layer that milling machine removing aluminum alloy cast ingot surface 15 ~ 25mm is thick, and amputate ingot casting two ends casting constriction, then the aluminium alloy cast ingot behind milling face is carried out Homogenization Treatments in batch-type furnace or shaft furnace, obtain the ingot casting after processing; Concrete, even post-processing temperature is 460 ~ 475 DEG C, and temperature retention time scope is 10 ~ 24h;
Ingot casting rolls in advance, aluminium alloy cast ingot is carried out rolling in advance thinning, is rolled rear ingot casting in advance, and rolling temperature is in advance 400 ~ 460 DEG C, and the thickness rolling rear ingot casting is in advance 150 ~ 250mm; It should be noted that, in this step, needing the aluminium alloy cast ingot to exceeding two-layer thickness of slab to roll process in advance, to improve ingot casting section structure uniformity;
Surface treatment and lamination electric welding, by the method that polishing or erosion are washed, pretreatment is carried out to the contact interface rolling rear ingot casting in advance, then fill neatly stacking for pretreated ingot casting with lamination machine, the laminate interface surrounding electricity consumption solid welding of ingot casting is fixed, obtain lamination ingot casting, again lamination ingot casting preheating is carried out lamination hot rolling welding after 400 ~ 460 DEG C, reduction in pass is 10% ~ 20%;
Lamination diffusion annealing, be carry out diffusion annealing under the condition of 460 DEG C in temperature by lamination ingot casting, annealing time is 12h;
Hot rolling, carries out hot rolling after lamination ingot casting is cooled to 400 ~ 460 DEG C, obtains aluminium alloy thick plate, and the hot rolling target thickness of aluminium alloy thick plate is 100 ~ 300mm.
Below, above-mentioned laminated rolling technique is introduced herein by four specific embodiment schemes.
Embodiment one:
Embodiment one specifically introduces the two-layer compound rolling scheme of 2024 alloy 150mm slabs.The program is 2024 aluminium alloy thick plates of 150 × 1800 × 7500mm for the production of specification, specifically comprises the following steps:
1) select materials;
The mass fraction of 2024 selected aluminum alloy blanks is: Cu4.0%, Mg1.5%, Mn0.54%, Zn0.25%, Si≤0.50%, Fe≤0.50%, Cr%≤0.10%, Ti≤0.15%, surplus is Al, and other single composition maximum level 0.05%, other composition total content is 0.15% to the maximum.
2) melting and melt treatment; This step specifically comprises following 2.1 ~ 2.3 3 steps:
2.1) fusion process carries out melting according to 2024 aluminium alloy smeltings, casting process, and smelting temperature is 700 ~ 750 DEG C, obtains melt A;
2.2) adopt twin-stage degassing and purifying system, online degassing processing is carried out to melt A, obtains melt B; The hydrogen content of the melt B after process controls within 0.12ml/100gAl;
2.3) adopt double-stage filtering to filter melt B, the first order adopts 30 ~ 40ppi ceramic filter plate to filter, and the second level adopts 40 ~ 60ppi ceramic filter plate to filter, and obtains melt C.
3) Thin Specs ingot casting casting;
By melt C routinely semi-continuous casting method cast, cast the ingot blank of Thin Specs 350 × 1800 × 2000mm.
4) ingot mill surface and Homogenization Treatments; This step specifically comprises following 4.1 and 4.2 two steps:
4.1) to shoot off the thick defect layer of aluminum alloy holding poles surface 15 ~ 25mm with milling machine, and will bottom ingot casting, saw is except 200mm, gate end saw is except 150mm;
4.2) in batch-type furnace or shaft furnace, carry out Homogenization Treatments behind milling face, Homogenization Treatments temperature is 470 DEG C, and homogenization time is 10h, obtains the aluminium alloy cast ingot after processing.
5) surface treatment and lamination electric welding; This step specifically comprises following 5.1 and 5.2 two steps:
5.1) process with the erosion contact interface place of washing method to ingot casting or the ingot casting after rolling in advance, remove the foreign material that surface is mainly oxide skin and greasy dirt;
5.2) with lamination machine dress ingot casting or the ingot casting after rolling in advance neatly stacking, laminate interface surrounding electricity consumption solid welding is fixed, send into hot-rolling mill production line after being preheating to 450 DEG C again and be rolled welding, rolling welding drafts 15%, after rolling welding, composite plate thickness is 510mm.
6) lamination diffusion annealing;
After lamination welding, be under the condition of 460 DEG C in temperature, carry out diffusion annealing, annealing time is 12h.
7) hot rolling;
By step 6) in the lamination ingot casting that obtains, after being cooled to 420 DEG C, carry out being hot-rolled down to 150mm, obtain finished product 2024 alloy 150mm slab.
Gross thickness 640mm before above-mentioned hot rolled plate rolling, after rolling, thickness is 150mm, general working rate 76.5%.Its even tissue, interface cohesion is firm, and obdurability, fatigue behaviour are up to standard, and product percent of pass reaches 90%.
Please refer to Fig. 2, Fig. 2 is the former technique of 2024 alloys and the metallographic structure comparison diagram of laminated rolling technique of the present invention.Left side in Fig. 2 is the metallographic structure figure of 2024 alloys amplification 200X of former explained hereafter, 2024 alloys that right side is laminated rolling explained hereafter of the present invention amplify the metallographic structure figure of 200X, from comparison diagram, the metallographic structure of 2024 alloys of laminated rolling explained hereafter of the present invention is better than the uniformity of former technique.
Embodiment two:
Embodiment two is specifically introduced three layers of 7075 alloy 200mm slabs and is rolled plate composite rolling scheme in advance.The program is 7075 aluminium alloy thick plates of 200 × 1600 × 10000mm for the production of specification, specifically comprises the following steps:
1) select materials;
The mass fraction of 7075 selected aluminum alloy blanks is: Si0.40%, Cu1.6%, Mg2.5%, Zn5.6%, Mn≤0.30%, Ti≤0.20%, Cr0.23%, Fe0.50%, surplus is Al, other single composition maximum level 0.05%, other composition total content maximum 0.15%.
2) melting and melt treatment; This step specifically comprises following 2.1 ~ 2.3 3 steps:
2.1) fusion process carries out melting according to 7075 aluminium alloy smeltings, casting process, and smelting temperature is 700 ~ 750 DEG C, obtains melt A;
2.2) adopt twin-stage degassing and purifying system, online degassing processing is carried out to melt A, obtains melt B; The hydrogen content of the melt B after process controls within 0.12ml/100gAl;
2.3) adopt double-stage filtering to filter melt B, the first order adopts 30 ~ 40ppi ceramic filter plate to filter, and the second level adopts 40 ~ 60ppi ceramic filter plate to filter, and obtains melt C.
3) Thin Specs ingot casting casting;
By melt C routinely semi-continuous casting method cast, cast the ingot blank of Thin Specs 350 × 1600 × 2000mm.
4) ingot mill surface and Homogenization Treatments; This step specifically comprises following 4.1 and 4.2 two steps:
4.1) to shoot off the thick defect layer of aluminum alloy holding poles surface 10 ~ 15mm with milling machine, and will bottom ingot casting, saw is except 200mm, gate end saw is except 150mm;
4.2) in batch-type furnace or shaft furnace, carry out Homogenization Treatments behind milling face, Homogenization Treatments temperature is 470 DEG C, and homogenization time is 10h, obtains the aluminium alloy cast ingot after processing.
5) ingot casting rolls in advance;
Rolling is in advance carried out to the ingot casting blank after above-mentioned process thinning, be thinned to the thickness of 250mm.
6) surface treatment and lamination electric welding; This step specifically comprises following 6.1 and 6.2 two steps:
6.1) process with the erosion contact interface place of washing method to ingot casting or the ingot casting after rolling in advance, remove the foreign material that surface is mainly oxide skin and greasy dirt;
6.2) with lamination machine dress ingot casting or the ingot casting after rolling in advance neatly stacking, laminate interface surrounding electricity consumption solid welding is fixed, send into hot-rolling mill production line after being preheating to 450 DEG C again and be rolled welding, rolling welding drafts 20%, after rolling welding, composite plate thickness is 600mm.
7) lamination diffusion annealing;
After lamination welding, be under the condition of 460 DEG C in temperature, carry out diffusion annealing, annealing time is 12h.
8) hot rolling;
By step 6) in the lamination ingot casting that obtains, after being cooled to 420 DEG C, carry out being hot-rolled down to 200mm, obtain finished product 7075 alloy 200mm slab.
Gross thickness 970mm before above-mentioned hot rolled plate rolling, after rolling, thickness is 200mm, general working rate 79.4%.Its even tissue, interface cohesion is firm, and obdurability, fatigue behaviour are up to standard, and product percent of pass reaches 90%.
Please refer to Fig. 3, Fig. 3 is the former technique of 7075 alloys and the metallographic structure comparison diagram of laminated rolling technique of the present invention.Left side in Fig. 3 is the metallographic structure figure of 7075 alloys amplification 200X of former explained hereafter, 7075 alloys that right side is laminated rolling explained hereafter of the present invention amplify the metallographic structure figure of 200X, from comparison diagram, the metallographic structure of 7075 alloys of laminated rolling explained hereafter of the present invention is better than the uniformity of former technique.
Embodiment three:
Embodiment three specifically introduces the two-layer compound rolling scheme of 5A06 alloy 170mm slab.The program is the 5A06 aluminium alloy thick plate of 170 × 1600 × 7500mm for the production of specification, specifically comprises the following steps:
1) select materials;
The mass fraction of selected 5A06 aluminum alloy blank is: Mg6.3%, Mn0.65%, Si≤0.40%, Zn≤0.20%, Fe≤0.40%, Cu≤0.10%, Ti0.06%, surplus is Al, other single composition maximum level 0.05%, other composition total content maximum 0.10%.
2) melting and melt treatment; This step specifically comprises following 2.1 ~ 2.3 3 steps:
2.1) fusion process carries out melting according to 5A06 aluminium alloy smelting, casting process, and smelting temperature is 700 ~ 750 DEG C, obtains melt A;
2.2) adopt twin-stage degassing and purifying system, carry out online degassing processing to melt A, obtain melt B, the hydrogen content of the melt B after process controls within 0.12ml/100gAl;
2.3) adopt double-stage filtering to filter melt B, the first order adopts 30 ~ 40ppi ceramic filter plate to filter, and the second level adopts 40 ~ 60ppi ceramic filter plate to filter, and obtains melt C.
3) Thin Specs ingot casting casting;
By melt C routinely semi-continuous casting method cast, cast the ingot blank of Thin Specs 350 × 1600 × 2000mm.
4) ingot mill surface and Homogenization Treatments; This step specifically comprises following 4.1 and 4.2 two steps:
4.1) to shoot off the thick defect layer of aluminum alloy holding poles surface 10 ~ 15mm with milling machine, and will bottom ingot casting, saw is except 200mm, gate end saw is except 150mm;
4.2) in batch-type furnace or shaft furnace, carry out Homogenization Treatments behind milling face, Homogenization Treatments temperature is 460 DEG C, and homogenization time is 10h, obtains the aluminium alloy cast ingot after processing.
5) surface treatment and lamination electric welding; This step specifically comprises following 5.1 and 5.2 two steps:
5.1) process with the erosion contact interface place of washing method to ingot casting or the ingot casting after rolling in advance, remove the foreign material that surface is mainly oxide skin and greasy dirt;
5.2) with lamination machine dress ingot casting or the ingot casting after rolling in advance neatly stacking, laminate interface surrounding electricity consumption solid welding is fixed, send into hot-rolling mill production line after being preheating to 450 DEG C again and be rolled welding, rolling welding drafts 15%, after rolling welding, composite plate thickness is 574mm.
6) lamination diffusion annealing;
After lamination welding, be under the condition of 460 DEG C in temperature, carry out diffusion annealing, annealing time is 12h.
7) hot rolling;
By step 6) in the lamination ingot casting that obtains, after being cooled to 420 DEG C, carry out being hot-rolled down to 170mm, obtain finished product 5A06 alloy 170mm slab.
Gross thickness 640mm before above-mentioned hot rolled plate rolling, after rolling, thickness is 170mm, general working rate 73.4%.Its even tissue, interface cohesion is firm, and obdurability, fatigue behaviour are up to standard, and product percent of pass reaches 90%.
Please refer to Fig. 4, Fig. 4 is the former technique of 5A06 alloy and the metallographic structure comparison diagram of laminated rolling technique of the present invention.Left side in Fig. 4 is the metallographic structure figure of the 5A06 alloy amplification 50X of former explained hereafter, the 5A06 alloy that right side is laminated rolling explained hereafter of the present invention amplifies the metallographic structure figure of 50X, from comparison diagram, the metallographic structure of the 5A06 alloy of laminated rolling explained hereafter of the present invention is better than the uniformity of former technique.
Embodiment four:
Embodiment four is specifically introduced three layers of 7050 alloy 250mm slabs and is rolled plate composite rolling scheme in advance, and the program is 7050 aluminium alloy thick plates of 250 × 1600 × 10000mm for the production of specification, specifically comprises the following steps:
1) select materials;
The mass fraction of 7050 selected aluminum alloy blanks is: Zn6.2%, Mg2.4%, Cu2.3%, Zr0.11%, Mn≤0.10%, Si≤0.12%, Fe≤0.15%, Cr%≤0.04%, Ti≤0.06%, surplus is Al, other single composition maximum level 0.05%, other composition total content maximum 0.15%.
2) melting and melt treatment; This step specifically comprises following 2.1 ~ 2.3 3 steps:
2.1) fusion process carries out melting according to 7050 aluminium alloy smeltings, casting process, and smelting temperature is 700 ~ 750 DEG C, obtains melt A;
2.2) adopt twin-stage degassing and purifying system, carry out online degassing processing to melt A, obtain melt B, the melt B hydrogen content after process controls within 0.12ml/100gAl;
2.3) adopt double-stage filtering to filter melt B, the first order adopts 30 ~ 40ppi ceramic filter plate to filter, and the second level adopts 40 ~ 60ppi ceramic filter plate to filter, and obtains melt C.
3) Thin Specs ingot casting casting;
By melt C routinely semi-continuous casting method cast, cast the ingot blank of Thin Specs 400 × 1600 × 2200mm.
4) ingot mill surface and Homogenization Treatments; This step specifically comprises following 4.1 and 4.2 two steps:
4.1) to shoot off the thick defect layer of aluminum alloy holding poles surface 10 ~ 15mm with milling machine, and will bottom ingot casting, saw is except 200mm, gate end saw is except 150mm;
4.2) in batch-type furnace or shaft furnace, carry out Homogenization Treatments behind milling face, Homogenization Treatments temperature is 470 DEG C, and homogenization time is 10h, obtains the aluminium alloy cast ingot after processing.
5) ingot casting rolls in advance;
Carry out rolling in advance to ingot casting blank thinning, be thinned to 250mm, hot-rolled temperature is 440 DEG C.
6) surface treatment and lamination electric welding; This step specifically comprises following 6.1 and 6.2 two steps:
6.1) process with the erosion contact interface place of washing method to ingot casting or the ingot casting after rolling in advance, remove the foreign material that surface is mainly oxide skin and greasy dirt;
6.2) with lamination machine dress ingot casting or the ingot casting after rolling in advance neatly stacking, laminate interface surrounding electricity consumption solid welding is fixed, send into hot-rolling mill production line after being preheating to 450 DEG C again and be rolled welding, rolling welding drafts 20%, after rolling welding, composite plate thickness is 600mm.
7) lamination diffusion annealing;
After lamination welding, be under the condition of 460 DEG C in temperature, carry out diffusion annealing, annealing time is 12h.
8) hot rolling;
By step 6) in the lamination ingot casting that obtains, after being cooled to 420 DEG C, carry out being hot-rolled down to 250mm, obtain finished product 7050 alloy 250mm slab.
Gross thickness 1110mm before above-mentioned hot rolled plate rolling, after rolling, thickness is 250mm, general working rate 77.5%.Its even tissue, interface cohesion is firm, and obdurability, fatigue behaviour are up to standard, and product percent of pass reaches 90%.
Please refer to Fig. 5, Fig. 5 is the former technique of 7050 alloys and the metallographic structure comparison diagram of laminated rolling technique of the present invention.Left side in Fig. 5 is the metallographic structure figure of 7050 alloys amplification 50X of former explained hereafter, 7050 alloys that right side is laminated rolling explained hereafter of the present invention amplify the metallographic structure figure of 50X, from comparison diagram, the metallographic structure of 7050 alloys of laminated rolling explained hereafter of the present invention is better than the uniformity of former technique.
By the introduction of above-mentioned four embodiment schemes, known, aluminium alloy thick plate laminated rolling technique provided by the invention, its key step has: the aluminum alloy blank required for selection, aluminium alloy cast ingot within melting and casting becomes 350 ~ 450mm thick, milling face, homogenising, need to carry out ingot casting and roll in advance and be thinned to 150 ~ 250mm before multilayer ply rolling; Roll rear employing chemistry and physical method in advance to the pretreatment of slab interface, by two pieces or polylith slab is superimposed, electric welding is integral, after being preheated to 400 ~ 460 DEG C, carry out lamination hot rolling welding, welding process reduction in pass need 10 ~ 20%; By the diffusion annealing at 460 DEG C in heat-treatment furnace of the composite plate blanks after laminated rolling seam, diffusion annealing waste heat after coming out of the stove, is utilized directly to be rolled into required finished product slab.The advantage of the method is by adopting aluminum alloy thin size ingot-casting, Thin Specs ingot casting rolls operation in advance and laminated rolling technology avoids the metallurgical technology difficult problem that ultra thick gauge macroscopic segregation of cast ingot, center porosity and structural homogenity difference etc. is difficult to capture, thus significantly improves the yield rate of slab.
Aluminium alloy thick plate laminated rolling technique provided by the invention has following beneficial effect: the sheet material prepared by the present invention adopts the Thin Specs aluminium alloy cast ingot sheet material of 350 ~ 450mm, ensure that the excellent metallurgical quality of ingot casting; Rolled in advance by ingot casting before lamination and improve ingot casting section structure uniformity; Laminated rolling, diffusion annealing and hot rolling three-procedure progressively improve the metallurgical machinery bond strength at laminate interface place, are conducive to the performance improving product; And adopt diffusion annealing waste heat to carry out hot rolling, save the energy further and be convenient to continuous seepage.
Compared with the aluminium alloy thick plate that the present invention is standby with conventional hot rolling ingot legal system, plate defect is few, and structural homogenity is good, product obdurability and fatigue behaviour up to standard, yield rate significantly promotes, and has good economic benefit and social benefit.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. an aluminium alloy thick plate laminated rolling technique, is characterized in that, comprises the following steps:
Melt melting, carries out melting by aluminum alloy blank, obtains melt;
Ingot casting is cast, and is become by described melt casting thickness to be the aluminium alloy cast ingot of 350 ~ 450mm;
Ingot mill surface and Homogenization Treatments, remove the defect layer that described aluminum alloy cast ingot surface 15 ~ 25mm is thick, and amputate casting constriction, then described aluminium alloy cast ingot is carried out Homogenization Treatments;
Ingot casting rolls in advance, described aluminium alloy cast ingot is carried out rolling in advance thinning, is rolled rear ingot casting in advance, and rolling temperature is in advance 400 ~ 460 DEG C, and the thickness rolling rear ingot casting is in advance 150 ~ 250mm;
Surface treatment and lamination electric welding, by the method that polishing or erosion are washed, pretreatment is carried out to the described contact interface rolling rear ingot casting in advance, then fill neatly stacking for pretreated ingot casting with lamination machine, the laminate interface surrounding electricity consumption solid welding of ingot casting is fixed, obtain lamination ingot casting, again described lamination ingot casting preheating is carried out lamination hot rolling welding after 400 ~ 460 DEG C, reduction in pass is 10% ~ 20%;
Lamination diffusion annealing, be carry out diffusion annealing under the condition of 460 DEG C in temperature by described lamination ingot casting, annealing time is 12h;
Hot rolling, carries out hot rolling after described lamination ingot casting is cooled to 400 ~ 460 DEG C, obtains aluminium alloy thick plate, and the hot rolling target thickness of described aluminium alloy thick plate is 100 ~ 300mm.
2. aluminium alloy thick plate laminated rolling technique according to claim 1, is characterized in that, in melt melting step, described aluminum alloy blank obtains melt A after the melting that smelting temperature is 700 ~ 750 DEG C.
3. aluminium alloy thick plate laminated rolling technique according to claim 2, is characterized in that, in melt melting step, carries out online degassing processing, obtain melt B to described melt A.
4. aluminium alloy thick plate laminated rolling technique according to claim 3, is characterized in that, in melt melting step, adopts birotor off gas system to carry out online degassing processing to described melt A.
5. aluminium alloy thick plate laminated rolling technique according to claim 3, it is characterized in that, the hydrogen content of described melt B is within 0.12ml/100gAl.
6. aluminium alloy thick plate laminated rolling technique according to claim 5, is characterized in that, in melt melting step, double-stage filtering is carried out to described melt B, the first order adopts 30 ~ 40ppi ceramic filter plate to filter, and the second level adopts 40 ~ 60ppi ceramic filter plate to filter, and obtains melt C.
7. aluminium alloy thick plate laminated rolling technique according to claim 6, is characterized in that, in ingot casting casting step, adopts semi-continuous casting method to cast described melt C.
8. aluminium alloy thick plate laminated rolling technique according to claim 1, is characterized in that, in ingot mill surface and Homogenization Treatments step, adopts the defect layer that described in milling machine mill off, aluminum alloy cast ingot surface 15 ~ 25mm is thick.
9. aluminium alloy thick plate laminated rolling technique according to claim 1, is characterized in that, in ingot mill surface and Homogenization Treatments step, in batch-type furnace or shaft furnace, described aluminium alloy cast ingot is carried out Homogenization Treatments.
10. aluminium alloy thick plate laminated rolling technique according to claim 9, is characterized in that, described Homogenization Treatments temperature is 460 ~ 475 DEG C, and temperature retention time scope is 10 ~ 24h.
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